Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"autorotation"”.
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Indikation zur Kinnplasitk nach Autorotation des Unterkiefers
… nachgewiesen werden, dass bedingt durch die Autorotation des Unterkiefers beträchtliche Veränderungen der Proportionen des Untergesichtes auftraten, die in direktem Zusammenhang mit dem Ausmaß und der Richtung der Impaktion des Oberkiefers standen. Im Durchschnitt kann mit einer 70-80 %igen …
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Autonomous Autorotation of a Tilt-Rotor Aircraft Using Model Predictive Control
… used for conventional helicopters, which require autorotational maneuvering and landing given a total power failure. With low inertia rotors and high disk loading of tilt rotor vehicles, this already difficult task becomes significantly more challenging. In this work, a model predictive controller …
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The assessment of a rotorcraft simulation model in autorotation by means of flight testing a light gyroplane
… to realistically emulate flight dynamics in autorotation was discussed, and possible suggestions for the reasons of mismatch were presented.
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Aeroelastic modelling of gyroplane rotors
… rotor during powered flight and a rotor in autorotation differ significantly. Gyroplanes in the UK have been involved in number of fatal accidents during the last two decades. Despite several research projects focused on gyroplane flight dynamics, the cause of some of gyroplane accidents …
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A parametric analysis of the start-up procedure and flight characteristics of a gliding autogyro
… has focused on helicopter design, only viewing autorotation as a means of achieving emergency landings. In contrast, this project utilized early rotor theory to develop algorithms which can predict unpowered rotor performance across the entire flight envelope. To validate these predictions, a …
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A new approach to modeling aviation accidents
… I investigate the causes for improper autorotations using both a conventional approach and the state-based approach. The conventional approach uses modifiers (e.g., “improper”, “misjudged”) associated with “24520: Autorotation” to identify improper autorotations in the pre-2008 system. …
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Design of an Experimental Rig to Characterize the Gust Response of Small Wind Turbines and Autorotating Seeds
… which are known for their ability to maintain autorotation in unsteady wind. The models were tested in a towing tank using a custom-built experimental rig. The setup was designed and constructed to allow for the measurement of instantaneous angular velocity of a rotor model towed at a …
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Zur Kiefergelenkssymptomatik vor und nach bimaxillärer Osteotomie in zentrischer Kondylenposition mit Doppel-Zwischensplint - Eine prospektive klinische Untersuchung
… in allen drei Raumebenen aufrechterhält und die Autorotation des Unterkiefers erlaubt. Der klinische Dysfunktionsindex und der anamnestische Dysfunktionsindex nach Helkimo wurden verwendet, um den funktionellen Status des mastikatorischen Systems zu erfassen. 83 Patienten wurden prä- und …
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Magnetic Forces for Intrusion of Buccal Segments in Dolichofacial Individuals with Anterior Open Bite : A Report of Six Cases
… Intrusion, Dolichofacial, Open Bite, Mandibular Autorotation.</p>
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A new appreciation of inflow modelling for autorotative rotors
… impact on the trim state of rotorcraft in autorotation, but a significant effect on the dynamic inflow models in certain flight conditions. In addition, this thesis includes a discussion about the small wake skew angle assumption, which is invariably used in the derivation of Peters and He …
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Viability and Validation of Near-Passive Descent Control for Quadrotor Systems
… All three methods utilize a variation of autorotation during descent to reduce the amount of energy consumed. The first method uses variable-pitch rotor blades to control the quadrotor's attitude during descent. This is shown by using a proportional-integral-derivative controller to …
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The Mapkey: Preliminary Design, Construction and Testing of a Novel UAV Platform for Cavity Surveying
… survey accuracy and reduced survey times. Autorotation is the state of flight where the main rotor rotates due to the flow of air upwards through the rotor. The constructed autorotating UAV passively falls through the cavity and rotates as it falls. A single-beam LiDAR payload attached to …
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Towards achieving power autonomy in soft-actuated micro aerial robots
… Third, we took inspiration from the natural autorotation of maple seeds in their slow descent. We implemented the first samara-inspired mechanism on micro aerial robots, enhancing lift generation while maintaining in-flight attitude stability without feedback control. The 1.22-gram vehicle …